Emil Zatopek Quotes
Quoted by Christopher Brasher in the Observer,12 Sep 1982.
It's at the borders of pain and suffering that the men are separated from the boys.
Attributed to Emil Zatopek in "Citius, Altius, Fortius" ("Swifter, Higher, Stronger"), an unsigned article from Khaleej Times, August 8, 2008.
Quoted in Colin Jarman The Guinness Dictionary of Sports Quotations (1990).